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fix(relinker): report processor 0 from RDTSCP under --to-rosetta

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Rosetta sets RDTSCP's ECX to its constant TSC_AUX, 0xAAAAAAAB, which is
not a processor index. --to-rosetta already makes RDPID return processor
0 for the same reason, so code reading the processor through RDTSCP saw
a different value from code reading it through RDPID.

--to-rosetta now moves RDTSCP into an optional stub that runs the
instruction unchanged and then loads 0 into ECX with a MOV, which
leaves the counter in EDX:EAX and the flags as they were. A site with no
movable instruction after it for the jump is kept, as for RDPID. The
Intel target and a plain relink are unchanged.
This commit is contained in:
Karim Masmoudi authored and Adrià Franch committed 2026-10-18 18:27:15 +02:00
1 parent d3d8d79c59
commit 57e52c1f03
7 files changed
+77 -5
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docs/user/USAGE.md
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@@ -62,7 +62,7 @@ All switches are disabled by default. `unused-filter` defaults to `0`; `--rpath`
| `--trace-imports` | Pass each function import through the libc.prx call tracer, see [tracing system library calls](#tracing-system-library-calls). Requires `--windows`; conflicts with `--lazy-binding`. |
| `--linux-fixed-base <address>` | Load the Linux executable at this fixed address, given in decimal or hexadecimal (`0x`): every virtual address of the image is offset by it, so virtual address 0 is placed at the address, as the console places an executable. Requires a 64 KiB-aligned address from `0x10000` through `0x7fffffff0000` that is a multiple of every `PT_LOAD` alignment, and an image that ends in the user address space. The executable is written as `ET_EXEC`, without ASLR. Bundled modules keep their normal placement. Conflicts with `--windows`, `--macos` and `--lazy-binding`. |
| `--to-intel` | Convert supported AMD-only instructions in the executable and bundled modules. Unsupported instructions or unreachable conversion stubs cause an error. |
| `--to-rosetta` | Convert as `--to-intel` does and also lower what Rosetta lacks: ANDN becomes scalar NOT/AND, RDSEED becomes RDRAND, CLWB a NOP, and RDPID returns processor 0. Implies `--to-intel`. Independent of `--macos`: `--macos` alone leaves these instructions as they are. Conflicts with `--windows`. |
| `--to-rosetta` | Convert as `--to-intel` does and also lower what Rosetta lacks: ANDN becomes scalar NOT/AND, RDSEED becomes RDRAND, CLWB a NOP, and RDPID and the ECX of RDTSCP return processor 0. Implies `--to-intel`. Independent of `--macos`: `--macos` alone leaves these instructions as they are. Conflicts with `--windows`. |
| `unused-filter=0` | Keep all imported NID references. |
| `unused-filter=1` | Filter unused non-PLT imports using control-flow and GOT access analysis, treating address-taken code as reachable; preserve PLT imports. |
| `unused-filter=2` | Apply strict unused-import analysis and compact the PLT. Unsupported analysis cases cause an error. |